They are, to me, hassle to deal with, They fit loose in the hitch. We had them for our TT and they did seem to keep the stones away. We have not use them on the 3400 and we do not have any stone damage???? Like KTmanic said "I will say it took some extra effort to get them to fit without wobbling around, to stay put, and be rock solid. If you mount them up per the instructions, they will wobble around a lot."
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